Sierra Leone | Santa Cruz de la Sierra | Sierra Nevada | Sierra Club | Sierra Nevada (U.S.) | Sierra Entertainment | Ford Sierra | Bo, Sierra Leone | Sierra Leone National Premier League | Sierra | Sierra Nevada de Santa Marta | Sierra Maestra | Sierra Leone People's Party | Sierra Leone Civil War | Special Court for Sierra Leone | Sierra Madre Occidental | Rubén Sierra | Javier Sierra | Antofagasta de la Sierra | The Treasure of the Sierra Madre (film) | The Treasure of the Sierra Madre | Sierra Leone Creole people | Northern Province, Sierra Leone | Sierra Madre | Sierra Boggess | High Sierra | Sierra Madre (Philippines) | Sierra Madre Oriental | Sierra Blanca | President of Sierra Leone |
Over the last 10 years, he has lived and worked in indigenous villages and border cities in Venezuela, investigating environmental conflicts and land rights struggles and conducting participatory mapping projects with the Pemon in the Gran Sabana and Yukpa in the Sierra de Perijá.